// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_STREAM_READER_H_
#define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_STREAM_READER_H_

#include "content/browser/service_worker/service_worker_url_request_job.h"
#include "content/browser/streams/stream_read_observer.h"
#include "content/browser/streams/stream_register_observer.h"
#include "net/url_request/url_request.h"

namespace net {
class IOBuffer;
}

namespace content {

class ServiceWorkerVersion;

// Reads a stream response for ServiceWorkerURLRequestJob.
// Owned by ServiceWorkerURLRequestJob.
class ServiceWorkerStreamReader : public StreamReadObserver,
                                  public StreamRegisterObserver {
public:
    // |streaming_version| is the ServiceWorkerVersion that must be kept alive
    // while the response is being read.
    ServiceWorkerStreamReader(
        ServiceWorkerURLRequestJob* owner,
        scoped_refptr<ServiceWorkerVersion> streaming_version);
    ~ServiceWorkerStreamReader() override;

    // Starts reading the stream. owner_->OnResponseStarted will be called when
    // the response starts.
    void Start(const GURL& stream_url);

    // Same as URLRequestJob::ReadRawData. If ERR_IO_PENDING is returned,
    // owner_->OnReadRawDataComplete will be called when the read completes.
    int ReadRawData(net::IOBuffer* buf, int buf_size);

    // StreamObserver override:
    void OnDataAvailable(Stream* stream) override;

    // StreamRegisterObserver override:
    void OnStreamRegistered(Stream* stream) override;

private:
    ServiceWorkerURLRequestJob* owner_;

    scoped_refptr<Stream> stream_;
    GURL waiting_stream_url_;
    scoped_refptr<net::IOBuffer> stream_pending_buffer_;
    int stream_pending_buffer_size_;

    scoped_refptr<ServiceWorkerVersion> streaming_version_;
};

} // namespace content

#endif // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_STREAM_READER_H_
